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annotate libtomcrypt/src/prngs/chacha20.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents 6dba84798cd5
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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10 /* the idea of re-keying loosely follows the approach used in:
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11 * http://bxr.su/OpenBSD/lib/libc/crypt/arc4random.c
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12 */
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13
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_CHACHA20_PRNG
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17
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18 const struct ltc_prng_descriptor chacha20_prng_desc =
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19 {
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20 "chacha20",
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21 40,
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22 &chacha20_prng_start,
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23 &chacha20_prng_add_entropy,
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24 &chacha20_prng_ready,
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25 &chacha20_prng_read,
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26 &chacha20_prng_done,
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27 &chacha20_prng_export,
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28 &chacha20_prng_import,
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29 &chacha20_prng_test
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30 };
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31
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32 /**
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33 Start the PRNG
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34 @param prng The PRNG state to initialize
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35 @return CRYPT_OK if successful
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36 */
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37 int chacha20_prng_start(prng_state *prng)
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38 {
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39 LTC_ARGCHK(prng != NULL);
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40 prng->ready = 0;
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41 XMEMSET(&prng->chacha.ent, 0, sizeof(prng->chacha.ent));
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42 prng->chacha.idx = 0;
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43 LTC_MUTEX_INIT(&prng->lock)
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44 return CRYPT_OK;
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45 }
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46
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47 /**
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48 Add entropy to the PRNG state
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49 @param in The data to add
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50 @param inlen Length of the data to add
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51 @param prng PRNG state to update
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52 @return CRYPT_OK if successful
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53 */
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54 int chacha20_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
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55 {
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56 unsigned char buf[40];
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57 unsigned long i;
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58 int err;
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59
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60 LTC_ARGCHK(prng != NULL);
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61 LTC_ARGCHK(in != NULL);
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62 LTC_ARGCHK(inlen > 0);
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63
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64 LTC_MUTEX_LOCK(&prng->lock);
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65 if (prng->ready) {
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66 /* chacha20_prng_ready() was already called, do "rekey" operation */
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67 if ((err = chacha_keystream(&prng->chacha.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK;
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68 for(i = 0; i < inlen; i++) buf[i % sizeof(buf)] ^= in[i];
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69 /* key 32 bytes, 20 rounds */
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70 if ((err = chacha_setup(&prng->chacha.s, buf, 32, 20)) != CRYPT_OK) goto LBL_UNLOCK;
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71 /* iv 8 bytes */
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72 if ((err = chacha_ivctr64(&prng->chacha.s, buf + 32, 8, 0)) != CRYPT_OK) goto LBL_UNLOCK;
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73 /* clear KEY + IV */
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74 zeromem(buf, sizeof(buf));
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75 }
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76 else {
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77 /* chacha20_prng_ready() was not called yet, add entropy to ent buffer */
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78 while (inlen--) prng->chacha.ent[prng->chacha.idx++ % sizeof(prng->chacha.ent)] ^= *in++;
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79 }
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80 err = CRYPT_OK;
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81 LBL_UNLOCK:
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82 LTC_MUTEX_UNLOCK(&prng->lock);
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83 return err;
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84 }
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85
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86 /**
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87 Make the PRNG ready to read from
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88 @param prng The PRNG to make active
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89 @return CRYPT_OK if successful
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90 */
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91 int chacha20_prng_ready(prng_state *prng)
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92 {
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93 int err;
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94
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95 LTC_ARGCHK(prng != NULL);
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96
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97 LTC_MUTEX_LOCK(&prng->lock);
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98 if (prng->ready) { err = CRYPT_OK; goto LBL_UNLOCK; }
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99 /* key 32 bytes, 20 rounds */
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100 if ((err = chacha_setup(&prng->chacha.s, prng->chacha.ent, 32, 20)) != CRYPT_OK) goto LBL_UNLOCK;
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101 /* iv 8 bytes */
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102 if ((err = chacha_ivctr64(&prng->chacha.s, prng->chacha.ent + 32, 8, 0)) != CRYPT_OK) goto LBL_UNLOCK;
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103 XMEMSET(&prng->chacha.ent, 0, sizeof(prng->chacha.ent));
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104 prng->chacha.idx = 0;
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105 prng->ready = 1;
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106 LBL_UNLOCK:
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107 LTC_MUTEX_UNLOCK(&prng->lock);
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108 return err;
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109 }
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110
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111 /**
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112 Read from the PRNG
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113 @param out Destination
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114 @param outlen Length of output
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115 @param prng The active PRNG to read from
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116 @return Number of octets read
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117 */
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118 unsigned long chacha20_prng_read(unsigned char *out, unsigned long outlen, prng_state *prng)
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119 {
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120 if (outlen == 0 || prng == NULL || out == NULL) return 0;
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121 LTC_MUTEX_LOCK(&prng->lock);
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122 if (!prng->ready) { outlen = 0; goto LBL_UNLOCK; }
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123 if (chacha_keystream(&prng->chacha.s, out, outlen) != CRYPT_OK) outlen = 0;
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124 LBL_UNLOCK:
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125 LTC_MUTEX_UNLOCK(&prng->lock);
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126 return outlen;
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127 }
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128
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129 /**
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130 Terminate the PRNG
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131 @param prng The PRNG to terminate
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132 @return CRYPT_OK if successful
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133 */
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134 int chacha20_prng_done(prng_state *prng)
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135 {
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136 int err;
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137 LTC_ARGCHK(prng != NULL);
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138 LTC_MUTEX_LOCK(&prng->lock);
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139 prng->ready = 0;
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140 err = chacha_done(&prng->chacha.s);
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141 LTC_MUTEX_UNLOCK(&prng->lock);
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142 LTC_MUTEX_DESTROY(&prng->lock);
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143 return err;
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144 }
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145
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146 /**
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147 Export the PRNG state
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148 @param out [out] Destination
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149 @param outlen [in/out] Max size and resulting size of the state
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150 @param prng The PRNG to export
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151 @return CRYPT_OK if successful
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152 */
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153 int chacha20_prng_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
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154 {
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155 unsigned long len = chacha20_prng_desc.export_size;
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156
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157 LTC_ARGCHK(prng != NULL);
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158 LTC_ARGCHK(out != NULL);
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159 LTC_ARGCHK(outlen != NULL);
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160
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161 if (*outlen < len) {
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162 *outlen = len;
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163 return CRYPT_BUFFER_OVERFLOW;
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164 }
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165
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166 if (chacha20_prng_read(out, len, prng) != len) {
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167 return CRYPT_ERROR_READPRNG;
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168 }
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169
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170 *outlen = len;
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171 return CRYPT_OK;
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172 }
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173
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174 /**
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175 Import a PRNG state
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176 @param in The PRNG state
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177 @param inlen Size of the state
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178 @param prng The PRNG to import
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179 @return CRYPT_OK if successful
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180 */
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181 int chacha20_prng_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
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182 {
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183 int err;
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184
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185 LTC_ARGCHK(prng != NULL);
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186 LTC_ARGCHK(in != NULL);
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187 if (inlen < (unsigned long)chacha20_prng_desc.export_size) return CRYPT_INVALID_ARG;
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188
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189 if ((err = chacha20_prng_start(prng)) != CRYPT_OK) return err;
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190 if ((err = chacha20_prng_add_entropy(in, inlen, prng)) != CRYPT_OK) return err;
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191 return CRYPT_OK;
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192 }
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193
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194 /**
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195 PRNG self-test
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196 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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197 */
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198 int chacha20_prng_test(void)
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199 {
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200 #ifndef LTC_TEST
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201 return CRYPT_NOP;
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202 #else
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203 prng_state st;
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204 unsigned char en[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
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205 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14,
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206 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
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207 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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208 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32 };
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diff changeset
209 unsigned char dmp[300];
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210 unsigned long dmplen = sizeof(dmp);
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diff changeset
211 unsigned char out[500];
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diff changeset
212 unsigned char t1[] = { 0x59, 0xB2, 0x26, 0x95, 0x2B, 0x01, 0x8F, 0x05, 0xBE, 0xD8 };
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diff changeset
213 unsigned char t2[] = { 0x47, 0xC9, 0x0D, 0x03, 0xE4, 0x75, 0x34, 0x27, 0xBD, 0xDE };
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diff changeset
214 unsigned char t3[] = { 0xBC, 0xFA, 0xEF, 0x59, 0x37, 0x7F, 0x1A, 0x91, 0x1A, 0xA6 };
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diff changeset
215 int err;
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diff changeset
216
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217 if ((err = chacha20_prng_start(&st)) != CRYPT_OK) return err;
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218 /* add entropy to uninitialized prng */
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diff changeset
219 if ((err = chacha20_prng_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
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diff changeset
220 if ((err = chacha20_prng_ready(&st)) != CRYPT_OK) return err;
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diff changeset
221 if (chacha20_prng_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
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diff changeset
222 if (compare_testvector(out, 10, t1, sizeof(t1), "CHACHA-PRNG", 1)) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
223 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
224 /* add entropy to already initialized prng */
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diff changeset
225 if ((err = chacha20_prng_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
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diff changeset
226 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
227 if ((err = chacha20_prng_export(dmp, &dmplen, &st)) != CRYPT_OK) return err;
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diff changeset
228 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
229 if (chacha20_prng_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
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diff changeset
230 if (compare_testvector(out, 10, t2, sizeof(t2), "CHACHA-PRNG", 2)) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
231 if ((err = chacha20_prng_done(&st)) != CRYPT_OK) return err;
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diff changeset
232 if ((err = chacha20_prng_import(dmp, dmplen, &st)) != CRYPT_OK) return err;
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diff changeset
233 if ((err = chacha20_prng_ready(&st)) != CRYPT_OK) return err;
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diff changeset
234 if (chacha20_prng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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diff changeset
235 if (chacha20_prng_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */
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diff changeset
236 if (compare_testvector(out, 10, t3, sizeof(t3), "CHACHA-PRNG", 3)) return CRYPT_FAIL_TESTVECTOR;
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diff changeset
237 if ((err = chacha20_prng_done(&st)) != CRYPT_OK) return err;
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diff changeset
238
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diff changeset
239 return CRYPT_OK;
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diff changeset
240 #endif
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diff changeset
241 }
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242
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diff changeset
243 #endif
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diff changeset
244
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diff changeset
245 /* ref: $Format:%D$ */
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diff changeset
246 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
247 /* commit time: $Format:%ai$ */